If someone used the car without permission, they are guilty of theft.
If they used the car with your permission, you should either be responsible for what they do with it, or be able to point to the person who was using it.
If they used the car with your permission, you should either be responsible for what they do with it, or be able to point to the person who was using it.
Sure, but I still don't know who they are, so I can't give their name over for either investigating the theft or reassigning the speeding/red light/parking fine.
If your car was magically stolen and returned, and you have no idea that it happened, or who could have done this... Well, that's certainly an interesting legal argument that you could make to a judge. I doubt he'll believe you.